Do all publishers of hybrid journals require payment of Article Processing Charges (APC)?

To publish in Open Access in subscription journals, payment of publication fees (APC) is generally required. However, some publishers — such as Annual Reviews — offer alternative models. Under the "Subscribe to Open" model, content is made freely accessible when a sufficient number of libraries maintain their journal subscription. In that case, no publication fee is charged to authors.

Special "Read & Publish" agreements have been concluded with publishers, allowing articles to be published in Open Access with no fees, or at a discount, in certain hybrid journals. The list of agreements can be found on the "Open Access Institutional Agreements" page.